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<a class="post-title-link" href="/2016/07/17/CSS-Filter-Effects-Blur-Grayscale-Brightness-and-More-in-CSS（译）/" itemprop="url">
CSS Filter Effects Blur Grayscale Brightness and More in CSS（译）
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2016-07-17
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<p>原文：<br><a href="https://www.sitepoint.com/css-filter-effects-blur-grayscale-brightness-and-more-in-css/">CSS Filter Effects Blur, Grayscale, Brightness and More in CSS!</a></p>
</blockquote>
<p><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-7-17/292468.jpg" alt=""><br><em>图为本文中一个 CSS 滤镜效果实例</em></p>
<p>滤镜是 SVG 规范原生的一部分。然而，当它们的用途变得更广泛时，W3C 也开始给 CSS 增加了一些常用的滤镜效果。CSS 滤镜非常强大又好用。你可以用它来模糊，变亮或饱和度调整图像。它们可以单独使用也可以和其它的滤镜组合使用。滤镜的 CSS 语法是这样的：</p>
<pre><code>filter: <filter-function> [<filter-function>]* | none
</code></pre><p>现在开始，我来对这些滤镜做一下简要的介绍。</p>
<h1 id="亮度"><a href="#亮度" class="headerlink" title="亮度"></a>亮度</h1><p>该滤镜控制图像的亮度。它接受大于或等于零的值作为它的参数。0％ 的值将变成黑色。100％ 的值则是原始图像。你可以指定值大于 100％ 得到更明亮的图像。比如 300％ 的值将使图像变成 3 倍亮：</p>
<pre><code>img { filter: brightness(300%); }
</code></pre><p><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-7-17/88955936.jpg" alt=""><br><em>原图</em></p>
<p><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-7-17/78247691.jpg" alt=""></p>
<h1 id="对比度"><a href="#对比度" class="headerlink" title="对比度"></a>对比度</h1><p>该滤镜控制图像的对比度。同上，它也接受大于或等于零的值。该滤镜控制 CSS 里图像的深色和浅色部分之间的差异。因此，0％ 的结果是一个灰色图像。设置对比度为 100％ 则是原始图像，超过之后将进一步提高图像的对比度：</p>
<pre><code>img { filter: contrast(0%); }
</code></pre><p><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-7-17/68479720.jpg" alt=""><br>
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<a class="post-title-link" href="/2016/07/03/Don’t-Overthink-It-Flexbox-Grids（译）/" itemprop="url">
Don’t Overthink It (Flexbox) Grids（译）
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<time itemprop="dateCreated" datetime="2016-07-03T21:41:22+08:00" content="2016-07-03">
2016-07-03
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<blockquote>
<p>原文：Don’t Overthink It (Flexbox) Grids</p>
<p>作者：Chirs Coyier</p>
<p><a href="https://css-tricks.com/dont-overthink-flexbox-grids/">https://css-tricks.com/dont-overthink-flexbox-grids/</a></p>
</blockquote>
<p>四年前，我贴出了一篇“Don’t Overthink It Grids”，它与一些人产生了共鸣。在当时，那可能是最高明的栅格系统。</p>
<p>那篇文章是我说道：“不要害怕，我们可以自己做一个栅格系统，不需要复杂的框架！”。它可能不是很花哨，不过你可以以一定比例的宽度漂浮一些元素。</p>
<p>现在，如果你学会玩转了 flexbox 布局，DIY 栅格系统就变得更容易了。</p>
<p>我现在经常用到的 HTML：</p>
<pre><code><div class="flex-grid">
<div class="col"></div>
<div class="col"></div>
<div class="col"></div>
</div>
</code></pre><p>CSS：</p>
<pre><code>.flex-grid {
display: flex;
}
.col {
flex: 1;
}
</code></pre><p>这可以支持任意数量的列，它们都是自动相等的宽度，非常灵活！</p>
<p>想让它们在小屏设备上也有用？很简单：</p>
<p>CSS：</p>
<pre><code>@media (max-width: 400px) {
.flex-grid {
display: block;
}
}
</code></pre><p>需要间隔？可以添加缩进和填充。我喜欢用对齐来创建列，比如：</p>
<pre><code>.flex-grid-thirds {
display: flex;
justify-content: space-between;
}
.flex-grid-thirds .col {
width: 32%;
}
</code></pre><p>如果你学会 Flexbox 的方法，也可以按需更改列，这可以保持更多的重要内容以及响应设计的调整。<br>
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利用 Real Favicon Generator 制作 favicon
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2016-06-20
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<p>本帖是参考了 sitepoiont 的这篇文章<a href="https://www.sitepoint.com/quick-tip-add-favicons-quickly-and-easily-to-your-html/">《Quick Tip: Add Favicons Quickly and Easily to Your HTML》</a>，补充一些个人的一点意见。下面来看看如何利用 <a href="http://realfavicongenerator.net/" title="Real Favicon Generator">Real Favicon Generator</a> 这个网站制作favicon。</p>
<h1 id="上传图片"><a href="#上传图片" class="headerlink" title="上传图片"></a>上传图片</h1><p>打开 <a href="http://realfavicongenerator.net/" title="Real Favicon Generator">Real Favicon Generator</a> 进入网站之后，点击右边的上传按钮即可上传准备用来制作 favicon 的图片，该图片有以下要求：</p>
<ol>
<li>可以是 PNG JPG SVG 等格式</li>
<li>至少是 70X70 像素</li>
<li>要想有最棒的效果，建议像素在 260X260以上</li>
</ol>
<p>这里我用了一张神烦狗的照片。</p>
<p><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-6-20/66917368.jpg" alt=""></p>
<h1 id="生成-favicon"><a href="#生成-favicon" class="headerlink" title="生成 favicon"></a>生成 favicon</h1><p>成功上传之后，页面跳转到生成 favicon 的界面，在这里可以自动生成 iOS、Android、Safari、Windows 等多种样式的favicon，具体还可以调整细节。<br><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-6-20/27601346.jpg" alt=""><br>
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图片悬停文字介绍效果
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<p>本次文章是一个简单的在图片上悬停弹出文字介绍的方法。</p>
<h1 id="先制作图片列表和介绍文字"><a href="#先制作图片列表和介绍文字" class="headerlink" title="先制作图片列表和介绍文字"></a>先制作图片列表和介绍文字</h1><p>先将图片的列表制作好,图片的高是 130 px，我给图片框设置 160 px的高度，下方的 30 px用来放入一个简略的文字介绍。</p>
<p><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-6-26/88154803.jpg" alt="插图1"></p>
<p>给图片下方添加a标签，添加相应的介绍文字，并设置 CSS 代码：</p>
<pre><code>.pics a {
position: absolute;
width: 265px;
height: 150px;
background:#000;
color: white;
line-height: 25px;
padding: 5px;
opacity: 0.8;
text-decoration: none;
}
</code></pre><p>于是每个图片的下方就有了简介的文字。<br><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-6-26/10498933.jpg" alt="插图2"></p>
<h1 id="实现文字介绍的出现"><a href="#实现文字介绍的出现" class="headerlink" title="实现文字介绍的出现"></a>实现文字介绍的出现</h1><p>其实文字也是写在图片后的 <code>a</code> 标签内的，设置了行高和父盒子的大小之后，就只有第一行出现在图片下方。</p>
<p><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-6-26/41958957.jpg" alt=""><br>
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右下角广告的制作
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<p>这是一篇制作一个简单的右下角广告的方法。</p>
<h1 id="先将广告放置在页面中"><a href="#先将广告放置在页面中" class="headerlink" title="先将广告放置在页面中"></a>先将广告放置在页面中</h1><p>利用 <code>position:fixed;</code> 可以将我们想要的对象放置在页面中，可以是一张图片、一个 gif 动画、一个 flash 视频等等，这里我用的是一张图片。</p>
<p><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-6-12/53705892.jpg" alt="AD图片"></p>
<p>它的 html 代码如下：</p>
<pre><code><div class="rightAd" id="adinfo">
<img src="img/ad.jpg" />
</div>
</code></pre><p>CSS 代码也很简单：</p>
<pre><code>.rightAd {
width:240px;
height:280px;
position:fixed;
right:0px;
bottom:0px;
}
</code></pre><p>设置好之后，这个图片就固定在页面的右下方无论怎么拖动页面，它都会在在右下角不滚动。</p>
<p><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-6-12/52159651.jpg" alt="添加AD"></p>
<h1 id="添加关闭按钮"><a href="#添加关闭按钮" class="headerlink" title="添加关闭按钮"></a>添加关闭按钮</h1><p>由于该图片一直在右下角，我们希望可以在它的右上角设置一个关闭按钮，点击它之后就让广告乖乖消失了。</p>
<p>和上一篇的那个回到顶部按钮类似，在 rightAd 里图片的后面添加一个 <code>a</code> 标签，指向空 <code>JavaScript</code>：</p>
<pre><code><a href="javascript:;" id="closeBtn" title="关闭广告"></a>
</code></pre><p>关闭按钮我从一堆 icon 里抠出来这个：</p>
<p><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-6-12/11575498.jpg" alt="logo"><br>
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回到顶部按钮的制作
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<p>我们经常会在浏览网页时，在比较长的页面上翻页之后，一旦想回到顶部去点导航栏或者想搜索些什么，可能需要用鼠标滚轮滚动多次才能回到顶部。比较方便的方法是在页面上浮动一个“回到顶部”的按钮，不管你在页面上哪个位置，点击它就能回到页面最顶部的位置了。</p>
<h1 id="常规实现回到顶部的方法"><a href="#常规实现回到顶部的方法" class="headerlink" title="常规实现回到顶部的方法"></a>常规实现回到顶部的方法</h1><p>最简单的方法无非是利用 HTML 里的锚点，给“回到顶部”按钮设置一个“#”的超链接，点击一下，就能很方便的回到顶部了。</p>
<pre><code><a href="#" id="baktop" title="回到顶部"></a>
</code></pre><h1 id="带滚动效果的回到顶部"><a href="#带滚动效果的回到顶部" class="headerlink" title="带滚动效果的回到顶部"></a>带滚动效果的回到顶部</h1><p>如果想点击“回到顶部”之后，页面能缓缓地回到顶部的位置，就需要给它设置 JavaScript 代码了，并且我们也能实现在页面一开始的第一屏不显示“回到顶部”按钮，只在页面滚动差不多第二页的时候才出现。</p>
<p>首先就不能把这个按钮设置成锚点了：</p>
<pre><code><a href="javascript:;" id="baktop" title="回到顶部"></a>
</code></pre><p>该按钮是这样一个图片，所以设置它的 CSS 样式：</p>
<p><img src="http://7xs50a.com1.z0.glb.clouddn.com/16-6-5/46529504.jpg" alt="logo"></p>
<pre><code>#baktop {
width:40px;
height:40px;